Seems to me like you want preamp/compressor all in one (the front panel input request seems to imply this). Regardless, my nomination for single-channel compressor for bass would be the Rane DC-24 Dynamic Controller. No presets, no front input, but the split-band compression is especially applicable to bass.

I have a Navigator, it truly is da bomb! Great on-board compressor, and very versatile if you use different speaker setups for different gigs with the stereo/mono/biamp switching and built-in crossover.